Issue 2018.25 - September 21, 2018

Authors: John Obermeyer and Christian Krupke Combines are rolling and wagons of grain are heading for dryers and storage. Already, questions have been received about soybean seed observed to be shrunken and/or discolored. Too, we typically get samples through the Purdue Plant and Pest Diagnostic Lab during harvest of seeds and asked to determine, which, if any, insect pest caused the damage. Bottom line…we need unharvested, damaged pods with the sample. For the last couple of years, there has been a noticeable population of green stink bug in some Indiana soybean fields. Both green stink bug adults and nymphs feed using their piercing-sucking mouthparts. They cause injury to soybean by puncturing pods and sucking fluid from the developing beans. This feeding also introduces bacteria, fungi and yeasts that may cause further damage. Seeds that do develop despite stink bug pod feeding may be smaller, shriveled, and/or discolored. This damage may[Read More…]

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Author: John Obermeyer Armyworm has been an occasional, yet unpleasant, surprise throughout this summer to those with grass crops, e.g, corn, orchardgrass, etc. One instance of late planted corn was documented in Pest&Crop 2018.17 (July 27). In previous late summers, we have received reports of established cover crops being denuded, in some cases from fall armyworm (different species than armyworm). Both species can consume large amounts of foliage as they “march” through a field. One major difference, armyworm feed only on grasses, while fall armyworm feeds on both grasses and broadleaves. Those with late season crops (ANYTHING GREEN) should be inspecting for feeding damage. This is very important for newly seeded forages and cover crops. Below is listing of high-risk situations until a killing freeze occurs: Newly seeded grasses of any kind, including but not limited to grass and mixed grass / alfalfa hay fields, and early planted small grains.[Read More…]

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Author: Bob Nielsen Weather conditions strongly influence in-field grain drydown. Plant characteristics can also influence in-field grain drydown. Early grain maturation usually means faster in-field grain drydown. Later grain maturation usually means slower in-field grain drydown. elayed maturity of corn due to late planting or simply cool growing seasons often translates into delayed or slow drydown of mature corn grain prior to harvest and, consequently, higher than desired grain moisture contents at harvest. Wetter grain at harvest increases the need for artificially drying the grain after harvest which, in turn, increases the growers’ production costs and can delay the progress of harvest itself. Conversely, an early or rapid drydown of the crop decreases growers’ costs and facilitates early or at least timely harvest of the crop prior to the colder and, often, wetter conditions of late fall. At the moment, the 2018 end of season is shaping up to look[Read More…]

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